The [code] function in vB was altered because of the tag.
Now instead of putting your tags behind a [code] tag, you just tag it with [noparse] and [/noparse]
Your output looks something like:
[b][u][i]Stuff goes here[/i][/u][/b]
or
[img]http://image.url.here/image.gifpg[/img]
If you're still absolutely in love with the little code box, then just put the noparse in the middle of it.
Code:
[b][u][i]Stuff goes here[/i][/u][/b]